Pneumatic-tool holder.



No. 824,250. I PATENTED JUNE 26, 1906. A. E. KNAPP. PNBUMATIG TOOL HOLDER. APPLIOATION FILED Nov. 27. 1905.

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.n @fw No. 824,250. PATENTED JUNE 26, 1906.

A. E. KNAPP. PN'EUMATIO TOOL HOLDER.

APPLICATION FILED NOV.27. 1905.

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AMBROSE EUGENE KNAPP, OF SEATTLE, WASHINGTON.

PN EUMATIC-.TOOLV HOLDER.

Specification of Letters Patent.

Application filed November 27,1905. Serial No. 289,232.

Tov all whom it may concern:

Be it known4 that I, AMBRosFJ EUGENE KNAPP, a citizen ofthe United States, and a resident of Seattle, in the county of King and State of Washington, and Improved Pneumatic Tool Holder, of

' which the followin is a speciication.

eral bracin My -invention re ates to holders, brackets, or Jframes *for supporting pneumatic hammers or drills; and the objects of m improvements are to provide means for t e support of pneumatic tools so constructed that the rebound ofthe pneumatic c linder will cause the supporting means for t e cylinder to be advanced toward the article or substance acted upon by thel tool, and to provide improved self-adjusting means for securing su porting means for tools to the faces of wal s, ceilings, or oors of mines or quarries.

I attain these objects by the constructions illustrated in the accompanying drawings, in whicha Fi e 1 is a view, partly in section, showing t e entire supportin means. yFig. 2 is a plan of the same, `talren om the bottom side of Fig. l. Fig. 3 is a view of the opposite side of Fig. 2 of a portion of the mechanism. Fig. 4' is an end view of the construction, taken from the right in Fi 1. Fig. 5 is an end view of the frame-ho der. Fig. 6 is a cros'ssection on the line A A of Fig. 7, showing a modified form of construction. Fig. 8 is a cross-section of a` front carriage on the line B B in Fig. 7. Fig. 9 is a view of a detail. Fig. 1() is a view of a blank from which the modified Jr'ront carriage is formed. Fig. 11 is a rear elevation of the rear carriage. Fig. 12 is a side elevation of the same. Fig. 13 is a view of the blank from which the rear carriage is formed.

, Similar reference characters refer to like parts throughout the several views.

Pneumatic drills are operated at eve conceivable angle to the faces of walls, oei?- ings, and iioors of the chambers, shafts, and tunnels of mines' and excavations, often in places where it is very diihcult to obtain lat- Jfor the tools and often where it is impossib e to hold the drill against the surface to be operated'upon. My present invention is designed to afford means whereby a pneumatic hammer used to operate a drill may be held at any' desired angle against any desired face' withoutlateral bracing or other have invented a newl Aeach other.

of twoarts, each s ee means to hold the drill against the material operated upon.

The pneumatic cylinder 1 in the drawings may be of any desired construction, and the Patented June 26,1906. i

drill-rod 2 is merely indicated as connected to the cylinder. The usual air-supply pipe 3 also forms no part of this invention. The sleeve 4 is provided with a square hole 5 and the grooves 6 which are formed wider at the bottom than at the top. In the grooves are seated and slidable the feathers 7, provided with ratchet-teeth and' with lugs at their inner ends to form jaws in which rests the rin -spring 8, which is adapted to permit the eathers to separate, but holds them from moving endwise with reference to The inner faces of the feathers are formed with double inclines 9 and 1 which are adapted to contact with similar inclines at the bottoms of the grooves 6 of the sleeve. Thus when the feathers are at their innermost position and the sleeve and feathers are introduced into a hole in arock-face and the sleeve portion of the holder is then pulled out the feathers will be separated, linally jamming all parts firmly in position in the hole. In practice then the operator will 'iirst drill a hole of the proper size and depth by-hand, and thus furnish an opening in which the holder may be secured.

Screwed onto the inner end of the sleeve 4 is a collar 11 Jrom which extend the two l rods or tubes 12. On these rods are two carriages, the larger rear carriage 13 carrying the pneumatic tool 1. This carriage is made composed of a halfve 14 a orizontal part 15, a vertical part 1 6, another half-sleeve 17, and a final vertical portion 18. Boltspassing through the vertical portions secure'the two halves together and also hold the cylinder 1 in position.

Attached to the carriage are rearwardlyextending arms 19, carrying a pin 20, upon which is pivoted the lever 21, which connects to the front carriage by means of the link 22 and bolt 23. The front carriage is much like the rear carriage and has a horizontal portion 24 and guide-sleeves 25. A spring 26 connects to the eye 27, secured to the rear carriage', and by means of the screw 28 and thumb-nut 29. connects to the front carriage. On the upper side of each carriageare mounted the pawls 31, which engage the ratchet- IOO- IOS-i teeth on the inner sides of the rods v12, which teeth may be formed directly on the rods or on small bars 32, secured to the rods. Springs 33 and 34 hold the paWls in engagement with the teeth.

The o eration of the tool-carrieris as follows: hen the entire machine has been secured in place by means of the sleeve and feathers 7 and the drill is in position, the carriages and cylinder 1 arepushedtoward the sleeve by the operator and air is admitted to the cylinder. The tool under normal conditions has little back kick g but when the piston begins to strike the end of the cylin- .der instead of the drill or chisel the back kick y' becomes heavy. This is transmitted-to the the sprin regulates the ressure on the drill. Rockrilling is usua ly accom lished byV lever 21 by the cylinder, which lever pushes the front carriage toward the sleeve 4. On the front' stroke of the piston or immediately after the kick the spring 26 will pull the rear carriage toward the sleeve. The balance .between the normal reaction of the cylinder and the spring is thereby restored and the tool-carrier is thus fed forward automatic-` ally. The thumb-nut 29 by the tension of crushing the material being dril ed at the bottom of the hole into a owder and space must be left around the dliill-shank for the discharge of this Waste. Were a round hole provided in `thesleeve 4 it could be made of no larger diameter than the shortest diameter ofthe square hole now shown, because of the thickness of metal necessary under the fastening members 7." The drill-shank that c ould be used in a round hole would necessarily be of less diameter than the hole, because of the space around the shank required for the disc arge of rock-waste; but by formin the hole square, as shown, a drill-rod of full diameter may be used and s ace still left for the discharge of' Waste roc and sufficient metal left to furnish supports for the feathers 7. When the drill is to be replaced by another, the sleeve is disengaged, the entire mechanism removed, the exchange made, and the apparatus returned to place, the loss of time being very slight.

On the second sheet of drawings modified constructions of the parts are shown. The tubes 40 are D-shaped and have secured to their inner sides the toothed bars 41, which are engaged by thepawls 42. The front car- I'lage is formed from a blank 43, which is bent as shown in Figs. 7 and 8 along the dotted lines in Fig. 10. The parts 44 and-45 are bent so as to form sleeves adapted to embrace the tubes 40. TheV strip 46 is bent' down, back, and thenup around the block 47,

the fingers 48 extending through the holes 49,

and being bent down lock theblock in place. The spring 50 for the pawls is held in the slot 51A in the block and valso by the screw 52,

which passes through the holes in the blockl and the strip 46, as shown'. seated-in the recesses 53. The bloc s, pawls, and spring for them on the front carriage and rear carriage are alike. v

The rear carriage is formed 'from the blank shown in Fig. 1 3, being bent on the dotted lines, the parts 54 and ,55.forming sleeves and the parts 56 and 57 the immediate support for the sleeve 58, in which the tool is mount ed. The parts 56 and 57 are held in roper position by rivets, as shown. Interc angeable sleeves adapt the support for tools of different diameters, and as the parts 56, 57, and 58 become roughened by the hard usa e new sleeves having smooth bores can be su stituted, vthus giving the tool a good guide.

The' "awls are The cap 59 is hinged to the part 57 and locked in place by the clip 64.

The strip 60 is bent down, forward, and up the reduced portion 61 being passed through the slot 61a and then bent back, as shown in Fig. 12, forming the arm to support the rear lever. This arm has an eye formed in its outer end, which supports the lever 62,Which has a hook at its lower end to engage the link 63, which link connects to the front carriage, as shown in Fig. 8. The lever isshown in dotted lines to permit the construction of the' end of the arm to be well shown, the construction of the lever being similar to thatin Fig. 1. The hook-bolt 66 is held in place by the thumb-nut 65 in the rear carriage, While the adjusting-bolt 52 carries the thumb-nut 67, which has a roughened lower surface to engage the roughened surface with which it contacts, as shown in Figs. 6 and 7, thus preventing its turning. The spring 68 acts in the same manner as the spring 26, and the operation of all the parts is generally the same as in the construction shown on the first sheet of the drawin s.

Having now explainer my improvements, what I claim as my invention, and desire to secure by Letters Patent, is-

1. 1n a tool-holder, the combination of a sleeve having a s uare hole and dovetail slots, longitudina lyextending engagin members mounted in said slots and provide with teeth on their outer sides and -a plurality of inclines on their inner sides, said sleeves having inclines correspondin thereprovided with inclines adapted to engage cor.

responding inclines on said sleeve, means to hold said engaging means in operative osition, a tool-holder carried by one end o said sleeve, and a tool adjustably mounted on said holder.v

lIO

3. In a tool-holder, the combination of a sleeve having dovetail grooves, adjustable engaging members mounted therein, par.- allel rods secured to said sleeve, a carnage mounted on said rcds, and a tool secured to said carriage.

4. In a tool-holder, the combination of a sleeve, slidable toothed and outwardly-movable engaging members mounted thereon, means to connect said engaging members and a tool-carrier secured to one end of said sleeve.

5. In a tool-holder, the combination of a sleeve having a square hole, engaging members Vmounted thereon, and a tool-carrier mounted on said sleeve, the corners of said square hole providing passages through which the Waste from the operation of the hold said sleeveirmly in position, the corners of said square hole roviding passages through which the Waste om the operation of the tool may be discharged along the l round shank of a tool havin the same diameter as the hole, substantia yas described.

7. In a tool-holder', the combination of a sleeve having a square hole to permit the passage of a drill-rod, and adjustable means to hold said sleeve rmly in position, the cor- AMBROSE EUGENE KNAPP Witnesses;

RoBT. F. Boo'rn, A. C. MARTIN. 

